Yes you can, but you need an Android device to do it.
Vodafone have removed the setting from the router and several newer versions of the Vodafone Broadband app (Why?). What you need to do is download the apk of 4.1.0 of the Android Vodafone Broadband app. This will allow you to change any channels manually.
Once you have installed the app and connected it to the router, you have to be quick because the app automatically updates itself to the latest version again around 5 minutes later after installing it. It doesn't even need the Google Play store to do it.
Once you have set up the Vodafone Broadband app you need to select the wifi networks, I configure my router with split SSID's for the 2.4Ghz and 5Ghz networks with the Guest network also turned on. Then you select the 2.4Ghz network scroll down and manually change the channel to a different one.
This is the only method of manually changing either the 2.4Ghz or 5Ghz channels, you must use an Android device to do it.
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